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Annotation of embedaddon/pcre/pcre32_utf32_utils.c, revision 1.1.1.1

1.1       misho       1: /*************************************************
                      2: *      Perl-Compatible Regular Expressions       *
                      3: *************************************************/
                      4: 
                      5: /* PCRE is a library of functions to support regular expressions whose syntax
                      6: and semantics are as close as possible to those of the Perl 5 language.
                      7: 
                      8:                        Written by Philip Hazel
                      9:            Copyright (c) 1997-2012 University of Cambridge
                     10: 
                     11: -----------------------------------------------------------------------------
                     12: Redistribution and use in source and binary forms, with or without
                     13: modification, are permitted provided that the following conditions are met:
                     14: 
                     15:     * Redistributions of source code must retain the above copyright notice,
                     16:       this list of conditions and the following disclaimer.
                     17: 
                     18:     * Redistributions in binary form must reproduce the above copyright
                     19:       notice, this list of conditions and the following disclaimer in the
                     20:       documentation and/or other materials provided with the distribution.
                     21: 
                     22:     * Neither the name of the University of Cambridge nor the names of its
                     23:       contributors may be used to endorse or promote products derived from
                     24:       this software without specific prior written permission.
                     25: 
                     26: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
                     27: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     28: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     29: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
                     30: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     31: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     32: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     33: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     34: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     35: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     36: POSSIBILITY OF SUCH DAMAGE.
                     37: -----------------------------------------------------------------------------
                     38: */
                     39: 
                     40: 
                     41: /* This module contains a function for converting any UTF-32 character
                     42: strings to host byte order. */
                     43: 
                     44: 
                     45: #ifdef HAVE_CONFIG_H
                     46: #include "config.h"
                     47: #endif
                     48: 
                     49: /* Generate code with 32 bit character support. */
                     50: #define COMPILE_PCRE32
                     51: 
                     52: #include "pcre_internal.h"
                     53: 
                     54: #ifdef SUPPORT_UTF
                     55: static pcre_uint32
                     56: swap_uint32(pcre_uint32 value)
                     57: {
                     58: return ((value & 0x000000ff) << 24) |
                     59:        ((value & 0x0000ff00) <<  8) |
                     60:        ((value & 0x00ff0000) >>  8) |
                     61:        (value >> 24);
                     62: }
                     63: #endif
                     64: 
                     65: 
                     66: /*************************************************
                     67: *  Convert any UTF-32 string to host byte order  *
                     68: *************************************************/
                     69: 
                     70: /* This function takes an UTF-32 string and converts
                     71: it to host byte order. The length can be explicitly set,
                     72: or automatically detected for zero terminated strings.
                     73: BOMs can be kept or discarded during the conversion.
                     74: Conversion can be done in place (output == input).
                     75: 
                     76: Arguments:
                     77:   output     the output buffer, its size must be greater
                     78:              or equal than the input string
                     79:   input      any UTF-32 string
                     80:   length     the number of 32-bit units in the input string
                     81:              can be less than zero for zero terminated strings
                     82:   host_byte_order
                     83:              A non-zero value means the input is in host byte
                     84:              order, which can be dynamically changed by BOMs later.
                     85:              Initially it contains the starting byte order and returns
                     86:              with the last byte order so it can be used for stream
                     87:              processing. It can be NULL, which set the host byte
                     88:              order mode by default.
                     89:   keep_boms  for a non-zero value, the BOM (0xfeff) characters
                     90:              are copied as well
                     91: 
                     92: Returns:     the number of 32-bit units placed into the output buffer,
                     93:              including the zero-terminator
                     94: */
                     95: 
                     96: int
                     97: pcre32_utf32_to_host_byte_order(PCRE_UCHAR32 *output, PCRE_SPTR32 input,
                     98:   int length, int *host_byte_order, int keep_boms)
                     99: {
                    100: #ifdef SUPPORT_UTF
                    101: /* This function converts any UTF-32 string to host byte order and optionally
                    102: removes any Byte Order Marks (BOMS). Returns with the remainig length. */
                    103: int host_bo = host_byte_order != NULL ? *host_byte_order : 1;
                    104: pcre_uchar *optr = (pcre_uchar *)output;
                    105: const pcre_uchar *iptr = (const pcre_uchar *)input;
                    106: const pcre_uchar *end;
                    107: /* The c variable must be unsigned. */
                    108: register pcre_uchar c;
                    109: 
                    110: if (length < 0)
                    111:   end = iptr + STRLEN_UC(iptr) + 1;
                    112: else
                    113:   end = iptr + length;
                    114: 
                    115: while (iptr < end)
                    116:   {
                    117:   c = *iptr++;
                    118:   if (c == 0x0000feffu || c == 0xfffe0000u)
                    119:     {
                    120:     /* Detecting the byte order of the machine is unnecessary, it is
                    121:     enough to know that the UTF-32 string has the same byte order or not. */
                    122:     host_bo = c == 0x0000feffu;
                    123:     if (keep_boms != 0)
                    124:       *optr++ = 0x0000feffu;
                    125:     }
                    126:   else
                    127:     *optr++ = host_bo ? c : swap_uint32(c);
                    128:   }
                    129: if (host_byte_order != NULL)
                    130:   *host_byte_order = host_bo;
                    131: 
                    132: #else /* SUPPORT_UTF */
                    133: (void)(output);  /* Keep picky compilers happy */
                    134: (void)(input);
                    135: (void)(keep_boms);
                    136: (void)(host_byte_order);
                    137: #endif /* SUPPORT_UTF */
                    138: return length;
                    139: }
                    140: 
                    141: /* End of pcre32_utf32_utils.c */